[Mailman-Developers] Re: Slow Performance on semi-large lists

[Michael Yount]

I made the same recommendation a few months ago. Later
scrutiny of how defer mode works (with 8.9.3, IIRC) uncovered that using
it caused relaying checks to be bypassed entirely.  I retracted the 
recommendation in early April:
  http://csf.colorado.edu/archive/2000/mj2-dev/msg00219.html

Looking at the check_rcpt section of the stock configuration
files for sendmail 8.11.1, it appears that this is still the case. 
If so, it is probably wise for administrators who, like me, have a
modest understanding of sendmail to use defer mode only on a restricted 
interface.

Michael

On 14 Dec 09:48, Chuq Von Rospach wrote:
> 
> Try setting
> 
> 	O DeliveryMode=defer
> 
> in your sendmail.cf. That causes sendmail to accept the mail without 
> making a DNS lookup on it first. Note that this also implies 
> DeliveryMode=queue, so stuff won't be delivered immediately. That 
> means (if you already aren't) that you need to do queue runs 
> aggressively using -q.
>